solve by substitution:

a-1.2b=-3
0.2b+0.6a=12

Why did the scarecrow become a master at solving equations? Because he always had a lot of hay for substitution!

Let's solve these equations using substitution:

First, let's solve the first equation for 'a':
a - 1.2b = -3

Adding 1.2b to both sides, we get:
a = 1.2b - 3

Now we can substitute this expression for 'a' in the second equation:
0.2b + 0.6(1.2b - 3) = 12

Let's simplify:
0.2b + 0.72b - 1.8 = 12

Combining like terms, we get:
0.92b - 1.8 = 12

Adding 1.8 to both sides:
0.92b = 13.8

Dividing both sides by 0.92:
b = 15

Now, substitute this value of 'b' back into the first equation to find 'a':
a - 1.2(15) = -3

Simplifying:
a - 18 = -3

Adding 18 to both sides:
a = 15

So the solution to the system of equations is:
a = 15 and b = 15.

Why did the clown go to math class? Because he wanted to improve his ability to solve equations and make people laugh at the same time!

To solve this system of equations by substitution, we can solve one equation for one variable and substitute it into the other equation. Let's solve the first equation for `a` in terms of `b`.

a - 1.2b = -3

First, isolate `a` by adding `1.2b` to both sides:

a = 1.2b - 3

Next, substitute this expression for `a` into the second equation:

0.2b + 0.6a = 12

0.2b + 0.6(1.2b - 3) = 12

Now, simplify and solve for `b`:

0.2b + 0.72b - 1.8 = 12

0.92b - 1.8 = 12

Add 1.8 to both sides:

0.92b = 13.8

Divide both sides by 0.92:

b = 15

Now that we have the value of `b`, let's substitute it back into the first equation to solve for `a`:

a - 1.2b = -3

a - 1.2(15) = -3

a - 18 = -3

Add 18 to both sides:

a = 15

So the solution to the system of equations is `a = 15` and `b = 15`.

To solve this system of equations by substitution, we'll solve one equation for one variable and then substitute that expression into the other equation.

Let's start by solving the first equation for 'a':
a - 1.2b = -3

Let's isolate 'a' by adding 1.2b to both sides:
a = 1.2b - 3

Now we have an expression for 'a' in terms of 'b'. We can substitute this expression into the second equation:

0.2b + 0.6a = 12

Substitute the expression for 'a' from the first equation:
0.2b + 0.6(1.2b - 3) = 12

Now we can simplify and solve for 'b':

0.2b + 0.72b - 1.8 = 12
0.92b = 12 + 1.8
0.92b = 13.8

Divide both sides by 0.92 to solve for 'b':
b = 13.8 / 0.92
b ≈ 15

Now that we have the value of 'b', we can substitute it back into the first equation to solve for 'a':

a = 1.2b - 3
a = 1.2(15) - 3
a ≈ 15 - 3
a ≈ 12

Therefore, the solution to the system of equations is:
a ≈ 12 and b ≈ 15